Nokia Voyager Reference Manual page 288

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Configuring Routing

BGP communities allow you to group a set of IP addresses and apply routing

decisions based on the identity of the group or community.

To implement this feature, you need to map a set of communities to certain

BGP local preference values. Then you can apply a uniform BGP

configuration to the community as a whole as opposed to each router within

the community. The routers in the community can capture routes that match

their community values.

Using community attributes, you can configure your BGP speaker to set,

append, or modify the community of a route that controls which routing

information is accepted, preferred, or distributed to other neighbors. The

following table displays some special community attributes that a BGP

speaker can apply.

Community Attribute

NO_EXPORT (0xFFFFFF01)

NO_ADVERTISE (0xFFFFFF02)

NO_EXPORT_SUBCONFED(0xFFFFFF03)

Refer to the communities documents (RFCs 1997 and 1998 as of this writing)

for further details.

Is not advertised outside a BGP

confederation boundary. A stand-

alone autonomous system that is not

part of a confederation should be

considered a confederation itself.

Is not advertised to other BGP

Is not advertised to external BGP

peers. This includes peers in other

members' autonomous systems

inside a BGP confederation.

Voyager Reference Guide